There's also leggings, which are identical to the skirt half of the robes: Falda luminaria. They'd be hidden anyway if you're using the robe.

There's also art for belt and boots in this artwork set. But to my knowledge none of them are available in the game. The belt, if it existed, would resemble Fajín Ban'thok (which is from the Dark Blue variant), but in a colour to match this set. The boots would have a similar patterning and colouring to the gloves.

There are four other colours of this artwork. Three have at least one piece available in the game, but only two as robes. The two unavailable ones are actually only subtle variations on the same blue and brown theme as most of the others, so not a huge loss. See: